You say the pack has a medium torso(which would be 21" from the Zpacks website), yet from the site- "Please note that the Extra-Small size pack is not tall enough for a normal torso height. You might consider a size Small instead if you want the belt to be at your hips".

So the question is, how did you get a medium(21") torso on an extra small zero? This is critical for me as my torso is just above 21, at 21.5" long.